I did this as well. It looks and feels great. I took the seat out and did it on the workbench. It is not very hard and there are videos that show step by step. I never got stuck.
I used The Seat Shop - Factory Match Replacement Seat Covers and Cushions - https://www.theseatshop.com/
Specifically: 2003 - 2009 Lexus Gx 470 - Front Row Driver Side Bottom Seat Cover - I - https://www.theseatshop.com/collections/2003-lexus-gx-470/products/2003-2009-lexus-gx-470-front-row-driver-side-bottom-seat-cover-ivory-oem-material-config-all-leather
From the invoice:
2003 - 2009 LEXUS GX 470 - FRONT ROW DRIVER SIDE BOTTOM SEAT COVER - IVORY OEM MATERIAL CONFIG. ALL LEATHER
It cost $253.94 with tax and shipping.
Also, I used this dye to buff up the rest of the seats:
Dye Size: 8oz - touchups / 1 seat front
Car Manufacturer: Lexus
Lexus Dye Color: Ivory - LEXUS20
from Auto Leather Dye | Car Leather Dye Kits and More - https://autoleatherdye.com/
One bottle did the other seats. I used a lot where it was cracked. It looks great but not sure how long it lasted (I don't remember what it looked like now).
I used The Seat Shop - Factory Match Replacement Seat Covers and Cushions - https://www.theseatshop.com/
Specifically: 2003 - 2009 Lexus Gx 470 - Front Row Driver Side Bottom Seat Cover - I - https://www.theseatshop.com/collections/2003-lexus-gx-470/products/2003-2009-lexus-gx-470-front-row-driver-side-bottom-seat-cover-ivory-oem-material-config-all-leather
From the invoice:
2003 - 2009 LEXUS GX 470 - FRONT ROW DRIVER SIDE BOTTOM SEAT COVER - IVORY OEM MATERIAL CONFIG. ALL LEATHER
It cost $253.94 with tax and shipping.
Also, I used this dye to buff up the rest of the seats:
Dye Size: 8oz - touchups / 1 seat front
Car Manufacturer: Lexus
Lexus Dye Color: Ivory - LEXUS20
from Auto Leather Dye | Car Leather Dye Kits and More - https://autoleatherdye.com/
One bottle did the other seats. I used a lot where it was cracked. It looks great but not sure how long it lasted (I don't remember what it looked like now).